Galaxy A36 5G SM-A366U1 firmware

The latest stable build is A366U1UEUADZIF (Android 17, feature update), first released on Oct 22, 2026 – 15 days ago. Samsung has published 17 stable builds for this model since Mar 9, 2025: 12 security and 5 feature updates, from Android 15 to Android 17. The current bootloader (binary) version is 10. A device on bit 10 only accepts firmware with bit 10 or higher – see downgrading and the bootloader bit.

Latest build
A366U1UEUADZIF
Released
Oct 22, 2026
Android
Android 17
Bootloader bit
10
Regions
14
Stable builds
17

Latest firmware by region (CSC)

Samsung builds firmware per region code (CSC). Pick the code that matches your device – it is shown under Settings › About phone › Software information › Service provider software version. Follow a code for its complete history.

CSCRegionLatest buildAndroidReleasedBuilds
ACGUSA (C Spire)A366U1UEUADZIFAndroid 17Oct 22, 202617
AIOUSA (Cricket)A366U1UEUADZIFAndroid 17Oct 22, 202617
ATTUSA (AT&T)A366U1UEUADZIFAndroid 17Oct 22, 202617
CCTUSA (Comcast)A366U1UEUADZIFAndroid 17Oct 22, 202617
DSAUSAA366U1UEUADZIFAndroid 17Oct 22, 202617
DSHUSAA366U1UEUADZIFAndroid 17Oct 22, 202617
LRAUSA (Bluegrass)A366U1UEUADZIFAndroid 17Oct 22, 202617
TFNUSA (TracFone)A366U1UES6BZB6Android 16–1
TMBUSA (T-Mobile)A366U1UEUADZIFAndroid 17Oct 22, 202617
TMKUSA (MetroPCS)A366U1UEUADZIFAndroid 17Oct 22, 202617
USCUSA (US Cellular)A366U1UEUADZIFAndroid 17Oct 22, 202617
VZWUSA (Verizon)A366U1UEUADZIFAndroid 17Oct 22, 202617
XAAUSA (unlocked)A366U1UEUADZIFAndroid 17Oct 22, 202617
XARUSA (Cellular South)A366U1UEUADZIFAndroid 17Oct 22, 202617

Firmware history (17 builds)

Every stable build (PDA version) Samsung has published for the SM-A366U1, newest first. “” is the earliest date the build appeared on Samsung's servers in any region. “” means Samsung no longer serves the file for that build.

Build (PDA)ReleasedAndroidTypeBitRegionsFile
A366U1UEUADZIFOct 22, 2026Android 17Feature1013on server
A366U1UESACZH1Sep 10, 2026Android 16Security1013on server
A366U1UES9CZG2Aug 4, 2026Android 16Security913on server
A366U1UES8CZF1Jul 1, 2026Android 16Security813on server
A366U1UES8CZE3Jun 8, 2026Android 16Security813on server
A366U1UEU7CZE2Jun 2, 2026Android 16Feature713on server
A366U1UES7BZDBMay 10, 2026Android 16Security713on server
A366U1UES6BZC2Mar 29, 2026Android 16Security613on server
A366U1UES6BZB6Mar 11, 2026Android 16Security614on server
A366U1UES5BZA1Jan 29, 2026Android 16Security513on server
A366U1UES4BYK3Nov 20, 2025Android 16Security413on server
A366U1UEU3BYI7Oct 1, 2025Android 16Feature313on server
A366U1UES3AYI1Sep 8, 2025Android 15Security313on server
A366U1UES3AYG1Jul 20, 2025Android 15Security313on server
A366U1UEU2AYD8May 18, 2025Android 15Feature213on server
A366U1UES2AYC4Apr 14, 2025Android 15Security213on server
A366U1UEU1AYBBMar 9, 2025Android 15Feature113on server

How to download SM-A366U1 firmware

We do not host firmware. Download it directly from Samsung's servers with a free open-source tool, for example samloader:

samloader download -m SM-A366U1 -r XAA

Replace XAA with your region code. Step-by-step instructions, including a graphical alternative: How to download Samsung firmware.

Changelog and security patch level

Samsung publishes the release notes for each update, including the security patch level, on its own site. They are listed per region – for example SM-A366U1 / XAA release notes on doc.samsungmobile.com. Each region page here links to the notes for that code.